Jorge De Leon works on splitter after session with Roger Clemens

KISSIMMEE, Fla. — Astros righty reliever Jorge De Leon threw the first 10 innings of his major league career last season. A 25-year-old who signed with the team out of the Dominican Republic in the summer of 2006, he’s been slowed some this spring because of right quadriceps soreness he felt during pitching fielding practice.

Two days ago, he threw a bullpen, and on Thursday, he’s set to throw light batting practice.

“I don’t feel anything,” De Leon said. “I feel good right now.”

De Leon still probably could use some seasoning: he only has 12 appearances at Class AAA, plus his 11 in the majors. But he’s been working on something since last year that he hopes can eventually help him stick around: a splitter.

Roger Clemens, a maestro of the pitch, taught it to him. He’s barely used it, but he’s trying to improve it in camp.

“Last year I tried, but it’s hard,” De Leon said. “I’m working now.”

In 41 games last season between Class AA and AAA, De Leon struck out 48 and walked 17 in 67 2/3 innings, posting a 3.46 ERA.